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change in the dependent variable

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In a multiple regression model y' = -3 + 5x1 + 3x2 + 5x3 + 4x4, if the value of x2 increases by 4 and the value of x3 decreases by 2, and the other two variables do not change, then the predicted value for y will change by how much?

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The solution provides detailed explanation how to find out the changes in the dependent variable based on changes in the dependent variables.

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